#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
    int n;
    int count = 0;
    scanf("%d", &n);
    while (n != 1)
    {
        if (n % 2 == 0)
            n = n / 2;
        else
            n = n * 3 + 1;
        count++;
    }
    printf("%d", count);
}
